svn commit: r310886 - head/sys/arm/ti/am335x

[Luiz Otavio O Souza]

Author: loos
Date: Sat Dec 31 02:18:08 2016
New Revision: 310886
URL: https://svnweb.freebsd.org/changeset/base/310886

Log:
  Fixes the sensor initialization, always reset the digital outputs to start.
  
  Obtained from:        pfSense
  MFC after:    3 days
  Sponsored by: Rubicon Communications, LLC (Netgate)

Modified:
  head/sys/arm/ti/am335x/am335x_scm.c

Modified: head/sys/arm/ti/am335x/am335x_scm.c
==============================================================================
--- head/sys/arm/ti/am335x/am335x_scm.c Sat Dec 31 02:02:42 2016        
(r310885)
+++ head/sys/arm/ti/am335x/am335x_scm.c Sat Dec 31 02:18:08 2016        
(r310886)
@@ -110,11 +110,14 @@ am335x_scm_attach(device_t dev)
        struct sysctl_oid_list *tree;
        uint32_t reg;
 
-       /* Set ADC to continous mode, clear output reset. */
-       reg = SCM_BGAP_CLRZ | SCM_BGAP_CONTCONV;
-       ti_scm_reg_write_4(SCM_BGAP_CTRL, reg);
-       /* Flush write. */
+       /* Reset the digital outputs. */
+       ti_scm_reg_write_4(SCM_BGAP_CTRL, 0);
+       ti_scm_reg_read_4(SCM_BGAP_CTRL, &reg);
+       DELAY(500);
+       /* Set continous mode. */
+       ti_scm_reg_write_4(SCM_BGAP_CTRL, SCM_BGAP_CONTCONV);
        ti_scm_reg_read_4(SCM_BGAP_CTRL, &reg);
+       DELAY(500);
        /* Start the ADC conversion. */
        reg = SCM_BGAP_CLRZ | SCM_BGAP_CONTCONV | SCM_BGAP_SOC;
        ti_scm_reg_write_4(SCM_BGAP_CTRL, reg);
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